本文選題：斑巖型銅礦床 + 圍巖蝕變��； 參考：《中國(guó)地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：銅礦峪銅礦床位于中條山銅多金屬成礦帶,是目前中國(guó)最古老的斑巖型銅(鉬)礦床之一。本文通過(guò)詳盡的野外地質(zhì)調(diào)查,查明礦床的圍巖蝕變和蝕變分帶特征,運(yùn)用顯微鏡、電子探針等研究蝕變礦物,對(duì)花崗閃長(zhǎng)斑巖體進(jìn)行鋯石LA-ICP-MS U-Pb定年、Lu-Hf同位素和地球化學(xué)分析,根據(jù)流體包裹體巖相學(xué)、顯微測(cè)溫、群包裹體成分和C、H、O、S同位素分析等研究,揭示成礦流體來(lái)源、性質(zhì)、演化以及成礦物質(zhì)的來(lái)源,進(jìn)而探討礦床成因。礦床早期的蝕變有鈉硅酸鹽化、鉀硅酸鹽化、青磐巖化,晚期的蝕變?yōu)殚L(zhǎng)石分解蝕變。在空間分布上,鈉硅酸鹽化位于巖體內(nèi)部,鉀硅酸鹽化位于巖體和周圍圍巖中,青磐巖化位于鉀硅酸巖化外側(cè),長(zhǎng)石分解蝕變疊加在早期鉀硅酸鹽化蝕變,位于鉀硅酸鹽化與青磐巖化之間;銅礦化應(yīng)開始于鉀硅酸鹽階段的晚期,石英硫化物階段是最主要的礦化階段,石英碳酸鹽階段次之,另外碳酸鹽階段也貢獻(xiàn)了部分銅。通過(guò)鋯石U-Pb測(cè)年,得到銅礦峪礦床斑巖的的上交點(diǎn)年齡,分別為2159±19Ma和2148±39Ma。而變花崗斑巖中輝鉬礦的Re-Os模式年齡為2129Ma,表明成巖成礦在時(shí)代上具有一致性。εHf(t)值大部分為負(fù)值,還有少量的正值,二階段模式年齡落于2706~3007Ma之間。表明銅礦峪銅礦斑巖體的巖漿源區(qū)的初始物質(zhì)主要來(lái)源于殼幔同熔的產(chǎn)物。成礦流體系統(tǒng)由早期的中高溫、高氧逸度、富CO2的巖漿熱液,經(jīng)過(guò)中階段的流體沸騰、溫度降低、氧逸度降低、CO2逸失等過(guò)程演化為還原性流體,導(dǎo)致大量金屬硫化物的沉淀,然后經(jīng)過(guò)大氣降水的不斷加入、溫度降低等過(guò)程,形成晚期的低溫、中低氧逸度、低鹽度、貧CO2的大氣降水熱液。氫氧同位素特征顯示,在成礦的早期階段,成礦流體主要為原生巖漿水,隨著成礦階段過(guò)程的進(jìn)行,大氣降水混入的比例則越來(lái)越多。碳氧同位素特征顯示成礦流體與花崗斑巖的關(guān)系比較密切,并受到后期的蝕變和混染作用影響,具有多源性的特征。硫同位素特征則顯示成礦物質(zhì)具有深源的特征。
[Abstract]:The copper ore deposit, located in the copper polymetallic metallogenic belt in the middle mountain, is one of the oldest porphyry copper (molybdenum) deposits in China. In this paper, a detailed field geological survey has been made to find out the alteration of the surrounding rock and the characteristics of alteration zoning. Using microscopes, electron probe and other altered minerals, the zircon LA-ICP-MS U- of the granodiorite rock mass was carried out. Pb dating, Lu-Hf isotopes and geochemical analysis, according to the study of fluid inclusion petrography, microthermometry, composition of group inclusions and C, H, O, S isotopes, reveals the origin, properties, evolution and origin of ore-forming fluids, and then discusses the genesis of ore deposits. The early alteration of the ore deposits was sodium silicate, potassium silicate and green rock. In space distribution, the sodium silicate salinization is located inside the rock mass, and the potassium silicate is located in the rock mass and surrounding rock. The rock rock is located in the lateral of the potassium silicate rock, and the decomposition alteration of the feldspar is superimposed on the early potash silicate alteration, which lies between the potassium silicates and the rock rock. In the late stage of the potassium silicate phase, the phase of the quartz sulfide is the most important phase, the quartz carbonate stage is the second stage and the carbonate phase contributes to some copper. Through the zircon U-Pb dating, the upper intersection age of the porphyry of the copper mine valley is obtained, which are 2159 + 19Ma and 2148 + 39Ma. respectively, and the Re-Os model of the molybdenite in the granite porphyry. The age is 2129Ma, indicating that the diagenesis and mineralization are consistent in the age. Most of the value of epsilon Hf (T) is negative, there is a small amount of positive value, and the two stage pattern age falls between 2706~3007Ma. Oxygen fugacity, the CO2 rich magmatic hydrothermal fluid, through the boiling of fluid in the middle stage, the decrease of temperature, the decrease of oxygen fugacity, the evolution of the CO2 fugacity, and the precipitation of a large number of metallic sulphides, and then the continuous addition of atmospheric precipitation and the reduction of temperature, form a late low temperature, medium and low oxygen fugacity, low salinity, and the poor CO2 atmosphere. The characteristics of hydrogen and oxygen isotopes show that in the early stage of the mineralization, the ore-forming fluid was mainly primary rock water. With the progress of the metallogenic stage, the proportion of atmospheric precipitation was more and more. The carbon and oxygen isotope characteristics showed that the relationship between the ore-forming fluid and the granite porphyry was closer, and was influenced by later alteration and contamination. The characteristics of sulfur isotope indicate that the ore-forming material has the characteristics of deep source.

【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.41

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